Torque sensor assembly and torque wrench
By using a combined torque sensor assembly of the first mount, the second mount, the transmission pin and the strain gauge in the torque wrench, the torque value deviation problem caused by the traditional wrench torque sensor structure is solved, and the accuracy and consistency of torque measurement are achieved. sex.
Patent Information
- Application Number
- CN202420699278.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-07
AI Technical Summary
The torque sensor structure of the traditional torque wrench causes the accuracy of the measured torque value to be affected by the applied position, resulting in a deviation of the torque value and cannot be calculated and recorded.
A torque sensor assembly including a first mounting base, a second mounting base, a transmission pin and a strain gauge is adopted. The transmission pin is perpendicular to the axis of the mounting base, and the strain gauge is attached to the side wall of the transmission pin to transmit torque through the transmission pin to ensure the torque value. The accuracy is not affected by the force position.
The accuracy and consistency of torque values regardless of the urge position is achieved, and the problem of deviation of torque values measured by traditional wrenches is solved.
Smart Images
Figure CN222299009U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a torque sensor component and a torque wrench, belonging to the technical field of screwing tools used in the process of assembling parts. Background Art
[0002] A torque wrench is a tool used to control torque when tightening bolts or nuts. It is one of the commonly used tools in mechanical engineering, automotive repair and other fields that require precise torque control. The main function of a torque wrench is to ensure that the bolts or nuts are properly tightened to prevent over-tightening or over-loosening, thereby improving the quality and safety of assembly. Most torque wrenches have adjustable torque settings, allowing the operator to set the required torque value according to specific requirements and specifications. Some torque wrenches are equipped with a digital display or a visual indicator that can display the current torque value. Some advanced torque wrenches may also be equipped with an audible or light signal to remind the operator that the set torque value has been reached.
[0003] Torque wrenches are usually designed to provide high torque accuracy to ensure that there will be no problems of over-tightening or over-loosening when tightening bolts. The accuracy of torque values measured by traditional torque wrenches is affected by the position of force application. Usually a marking line is set on the handle, and the force application position is based on the position of the marking line. If it deviates from the marking line, the torque value measured by the torque wrench will be deviated. The deviation value varies due to the different distances from the force application position to the marking line. During operation, operators often deviate from the marking line to apply force, especially when large torque operations are performed, which requires both hands to apply force, which results in a worse accuracy of the measured torque value, and the deviation value cannot be calculated or recorded. This situation where the torque value deviation is caused by different force application positions is mainly caused by the structural characteristics of the torque sensor. In the past, the torque sensor in the torque wrench was cantilevered. The advantages of this design are simple structure, small size, shape consistent with the torque wrench axis, and easy installation. The principle is that the cantilever material is bent and deformed under force, so that the strain gauge attached to the cantilever beam is also deformed accordingly. The deformation of the strain gauge generates an electrical signal, and the electrical signal is linearly distributed with the material force change. The purpose of measuring force is achieved by collecting the electrical signal. The bending deformation of the cantilever beam under force at the strain gauge of this sensor is related to the distance between the force application point and the strain gauge and the magnitude of the force. Therefore, different positions of the torque wrench during operation will cause the torque wrench to measure different torque values. Utility Model Content
[0004] Therefore, the purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a torque sensor assembly and a torque wrench.
[0005] In order to achieve the above-mentioned purpose, the utility model provides a torque sensor assembly, including a first mounting seat, a second mounting seat, a transmission pin and a strain gauge, wherein the first mounting seat and the second mounting seat are fixedly connected by a transmission pin, the transmission pin is arranged perpendicular to the axis of the first mounting seat and the second mounting seat, and the two ends of the transmission pin are respectively fixed to the first mounting seat and the second mounting seat, and the strain gauge is attached to the side wall of the transmission pin.
[0006] The transmission pin includes connecting parts at two ends and a rod part at the middle, the two connecting parts are respectively fixed on the first mounting seat and the second mounting seat, and the strain gauge is attached to the rod part.
[0007] A first plugging hole and a second plugging hole are respectively arranged on the first mounting seat and the second mounting seat, and the two connecting parts are respectively non-rotatably plugged into the first plugging hole and the second plugging hole.
[0008] The cross section of the connecting portion is non-circular, and correspondingly, the cross sections of the first plugging hole and the second plugging hole are also non-circular.
[0009] The cross section of the connecting portion is square, and correspondingly, the cross sections of the first plugging hole and the second plugging hole are square holes.
[0010] The connecting portion is provided with a key or a spline, and correspondingly, the first plug hole and the second plug hole are provided with a key groove or a spline groove.
[0011] A locking pin is also provided on the first mounting seat and the second mounting seat respectively. The locking pin passes through the connecting portion and the pin holes located on the first mounting seat and the second mounting seat.
[0012] The first and second mounting seats are provided with a first semi-cylindrical portion and a second semi-cylindrical portion at opposite ends thereof, respectively. The first semi-cylindrical portion is placed on the second semi-cylindrical portion, and the transmission pin is fixedly connected between the first semi-cylindrical portion and the second semi-cylindrical portion.
[0013] The first semi-cylindrical portion and the second semi-cylindrical portion are respectively provided with arc-shaped ends.
[0014] The utility model also provides a torque wrench, comprising a wrench head, a force transmission arm, a handle and the torque sensor assembly as described above; the wrench head is fixedly connected to the first mounting seat, the force transmission arm is fixedly connected to the second mounting seat, and the handle is connected to an end of the force transmission arm away from the second mounting seat; a plug-in portion for cooperating with a piece to be screwed is provided on the wrench head, and the axis of the transmission pin in the torque sensor assembly is parallel to the axis of the plug-in portion.
[0015] By adopting the above technical solution, the torque sensor assembly and torque wrench of the utility model use the torque sensor assembly as a connecting component between the wrench head and the force transmission arm. The torque from the force transmission arm reaches the wrench head through the transmission pin, so that the torque value can be obtained through the deformation of the transmission pin under the torque. Therefore, no matter where the operator applies force on the handle or the force transmission arm, a relatively accurate torque value can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the torque wrench of the utility model.
[0017] Figure 2 Schematic diagram of the assembly structure of the torque sensor component.
[0018] Figure 3 for Figure 2 AA section view in.
[0019] Figure 4 It is a structural schematic diagram of embodiment 1 of the connecting part.
[0020] Figure 5 It is a structural schematic diagram of embodiment 2 of the connecting part.
[0021] Figure 6 It is a structural schematic diagram of embodiment 3 of the connecting part.
[0022] In the figure: 1. wrench head; 1a. plug-in part; 2. torque sensor assembly; 21. strain gauge; 22. transmission pin; 221. connecting part; 222. rod; 23. first mounting seat; 231. first plug-in hole; 23a. first semi-cylindrical part; 24. second mounting seat; 241. second plug-in hole; 24a. second semi-cylindrical part; 25. locking pin; 3. force transmission arm; 4. controller cover; 5. button assembly; 6. handle. DETAILED DESCRIPTION
[0023] The present invention is further described in detail below through the accompanying drawings and specific implementation methods.
[0024] like Figure 1-Figure 2 As shown, the utility model provides a torque wrench, comprising a wrench head 1, a handle 6, a force transmission arm 3 and a torque sensor assembly 2.
[0025] like Figure 3 , Figure 4As shown, in this embodiment, the torque sensor assembly 2 includes a first mounting seat 23, a second mounting seat 24, a transmission pin 22 and a strain gauge 21. The first mounting seat 23 and the second mounting seat 24 are fixedly connected by the transmission pin 22. The transmission pin 22 is arranged perpendicular to the axis of the first mounting seat 23 and the second mounting seat 24, and the two ends of the transmission pin 22 are respectively fixed on the first mounting seat 23 and the second mounting seat 24, and the strain gauge 21 is attached to the side wall of the transmission pin 22.
[0026] The driving pin 22 includes connecting parts 221 at both ends and a rod part 222 at the middle. The two connecting parts 221 are fixed to the first mounting seat 23 and the second mounting seat 24 respectively. The strain gauge 21 is attached to the rod part 222 .
[0027] A first plugging hole 231 and a second plugging hole 241 are respectively provided on the first mounting seat 23 and the second mounting seat 24 , and the two connecting parts 221 are respectively non-rotatably plugged into the first plugging hole 231 and the second plugging hole 241 .
[0028] The cross section of the connecting portion 221 is non-circular, and the cross sections of the first plug hole 231 and the second plug hole 241 are also non-circular. In this embodiment, the cross section of the connecting portion 221 is square, and correspondingly, the cross sections of the first plug hole 231 and the second plug hole 241 are square holes. After the connecting portion 221 is inserted into the square hole, it matches with the square hole, and the torque is transmitted during the screwing operation, so as to prevent the connecting portion 221 from rotating relative to the first mounting seat 23 or the second mounting seat 24. In other embodiments, such as Figure 5 or Figure 6 As shown, the connecting portion 221 is provided with a key or a spline, and correspondingly, the first plug hole 231 and the second plug hole 241 are provided with a key groove or a spline groove.
[0029] The first semi-cylindrical part 23a and the second semi-cylindrical part 24a are respectively provided at the opposite ends of the first mounting seat 23 and the second mounting seat 24. The first semi-cylindrical part 23a is placed on the second semi-cylindrical part 24a, and the transmission pin 22 is fixedly connected between the first semi-cylindrical part 23a and the second semi-cylindrical part 24a. The first semi-cylindrical part 23a and the second semi-cylindrical part 24a are respectively provided with arc-shaped ends. The first semi-cylindrical part 23a and the second semi-cylindrical part 24a are also respectively provided with locking pins 25, and the locking pins 25 pass through the connecting part 221 and the pin holes on the first semi-cylindrical part 23a and the second semi-cylindrical part 24a.
[0030] The wrench head 1 may be a ratchet head, which is fixedly connected to the first mounting seat 23, the force transmission arm 3 is fixedly connected to the second mounting seat 24, and the handle 6 is connected to the end of the force transmission arm away from the second mounting seat 24. The wrench head 1 is provided with a plug-in portion 1a for cooperating with the screwed piece, and the plug-in portion 1a may be a columnar body for inserting into the inner hexagonal hole or the inner square hole at the end of the screwed piece, or may be a ring body for sleeved on the outside of the nut, and the axis of the transmission pin 22 in the torque sensor assembly is parallel to the axis of the plug-in portion 1a (and the rotation axis of the screwed piece).
[0031] During the screwing process, the first mounting seat 23 is subjected to the torque transmitted by one end of the transmission pin 22, and the second mounting seat 24 applies the torque to the other end of the transmission pin 22, so that the transmission pin 22 is subjected to the stress and undergoes torsional deformation, and the strain gauge 21 accordingly generates an electrical signal that is linearly related to the material deformation. In the torque sensor assembly including the first mounting seat 23, the second mounting seat 24, the transmission pin 22 and the strain gauge 21, the torsional deformation is only related to the magnitude of the force, and has nothing to do with the location where the force is applied, thereby solving the problem that the accuracy of the torque wrench measurement value is affected by the location where the operator applies the force.
[0032] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention of the utility model.
Claims
1. A torque sensor assembly, characterized in that: It includes a first mounting seat, a second mounting seat, a transmission pin and a strain gauge. The first mounting seat and the second mounting seat are fixedly connected by a transmission pin. The transmission pin is arranged perpendicular to the axis of the first mounting seat and the second mounting seat, and the two ends of the transmission pin are respectively fixed to the first mounting seat and the second mounting seat. The strain gauge is attached to the side wall of the transmission pin.
2. The torque sensor assembly according to claim 1, characterized in that: The transmission pin includes connecting parts at two ends and a rod part at the middle, the two connecting parts are respectively fixed on the first mounting seat and the second mounting seat, and the strain gauge is attached to the rod part.
3. The torque sensor assembly according to claim 2, characterized in that: A first plugging hole and a second plugging hole are respectively arranged on the first mounting seat and the second mounting seat, and the two connecting parts are respectively non-rotatably plugged into the first plugging hole and the second plugging hole.
4. The torque sensor assembly according to claim 3, characterized in that: The cross section of the connecting portion is non-circular, and correspondingly, the cross sections of the first plugging hole and the second plugging hole are also non-circular.
5. The torque sensor assembly according to claim 4, characterized in that: The cross section of the connecting portion is square, and correspondingly, the cross sections of the first plugging hole and the second plugging hole are square holes.
6. The torque sensor assembly according to claim 4, characterized in that: The connecting portion is provided with a key or a spline, and correspondingly, the first plug hole and the second plug hole are provided with a key groove or a spline groove.
7. The torque sensor assembly according to any one of claims 2 to 6, characterized in that: A locking pin is also provided on the first mounting seat and the second mounting seat respectively. The locking pin passes through the connecting portion and the pin holes located on the first mounting seat and the second mounting seat.
8. The torque sensor assembly according to any one of claims 1 to 6, characterized in that: The first and second mounting seats are provided with a first semi-cylindrical portion and a second semi-cylindrical portion at opposite ends thereof, respectively. The first semi-cylindrical portion is placed on the second semi-cylindrical portion, and the transmission pin is fixedly connected between the first semi-cylindrical portion and the second semi-cylindrical portion.
9. The torque sensor assembly according to claim 8, characterized in that: The first semi-cylindrical portion and the second semi-cylindrical portion are respectively provided with arc-shaped ends.
10. A torque wrench, characterized in that: It comprises a wrench head, a force transmission arm, a handle and a torque sensor assembly as described in any one of claims 1 to 9; the wrench head is fixedly connected to the first mounting seat, the force transmission arm is fixedly connected to the second mounting seat, and the handle is connected to an end of the force transmission arm away from the second mounting seat; a plug-in portion for cooperating with a part to be screwed is provided on the wrench head, and the axis of the transmission pin in the torque sensor assembly is parallel to the axis of the plug-in portion.